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Old 05-05-2008, 10:31 PM
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305 TPI to 350 TPI

Hi,

I buy a chevrolet camaro 1986 305 tpi with new rebuilt motor, but is not inside the car, the guy tell me is a 355 with 305 HO 416 head (valve 1.94 and 1.50) and flat piston, 10.5:1 compression, and use everything 305 piece on it, but change the inkector for 350

My question is 10.5:1 compression is good for normal gaz ??


I need change Prom or another thing for use the 350 TPI ??

Thank you

Éric

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Old 05-06-2008, 01:23 PM
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[QUOTE=Parisienne70]Hi,

I buy a chevrolet camaro 1986 305 tpi with new rebuilt motor, but is not inside the car, the guy tell me is a 355 with 305 HO 416 head (valve 1.94 and 1.50) and flat piston, 10.5:1 compression, and use everything 305 piece on it, but change the inkector for 350

My question is 10.5:1 compression is good for normal gaz ??


I need change Prom or another thing for use the 350 TPI ??

Thank you

ɛ/QUOTE]

Without a long duration cam, a manual transmission, and some stiff rear gears, the 10.5 compression will prove to be too much with cast iron heads. While 305 heads make getting big compression on a 350 pretty easy, they aren't really up to the task. The chamber shape interferes with intake flow and the spark plug is too far off center. They are the antithesis of modern fast burn chamber thinking. Why anyone continues to play with this 1980s technology escapes me. This is what we did nearly 30 years ago when there wasn't anything else that was affordable to the average guy. Today the cost of modifying a set of 416 heads is close to the cost of a set of new Vortecs which will provide 40 more horses before or without similar porting modifications as required by the 416s.

Plus you'll probably need to chip the computer, there's more difference between the 305 and 350 than just larger injectors. Plus the injection needs to be knowledgeable about the vehicle, transmission type and gearing, rear gearing, weight, stuff like that come into the equations.

Bogie
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